But along with some serious medical and health questions, he got a lot of vitriol and name-calling, with the word "quackery" mentioned more than once.

Oz came under fire in June when he was "grilled" and "scolded" by a Senate panel on consumer protection, asked why he was describing certain supplements on his show as a "magic weight-loss cure," and "the No. 1 miracle in a bottle."

After the hearing, he seemed unscathed and posted a Facebook note saying he looked forward to finding a way to "deal" with scams.